Sketch Thieves (Purple Martian / Free Festival)

Don’t worry – the thievery in this show is all consensual. Four sketch groups volunteer to perform a slice of their material in the first half, and then for the second they have to attempt to perform each other’s. Will Mars’ spin-off from his successful ‘Joke Thieves’ stand-up compilation show, this proves to be a riotous hour of improvisation and adaptation. We saw sketch groups Northern Power Blouse, Bad Clowns, Two Little Dickheads and Double Denim put themselves through the thievery wringer, and given how different their respective styles were, seeing the jokes of one group through the lens of another proved to be both funny and genuinely interesting. If you go, get there early – our performance was packed out.